Drive mechanism for calculating machines



R. FEUMMLEZR DRIVE MECHANISM FOR CALCULATING MACHINES Filed March 5 Aug 13, 1925 R. RUMMLER 13 MECHANISM FOR CALCULATING MACHINES Filed March 5, 19 3 sheets sheet 2 Aug, 185 19250 1,550,326

. R. RUMMLER DRIVE MECHANISM FOR CALCULATING MACHINES Filed March 5, 1924 5 Sheets-Sheet 3 il ilfflfimi Aug. 18, 1925..

RUME ELEE, 013 WILMETTE, ILLINOIS.

lipplicetiori filed March 5, i924.

' To all whom it may concern-.-

Be it known that l, Rooow RUB/IMIJER, a citizen of the United States of America, and a resident "Wilmette, in the county of Cool: and State of Illinois, have invented new and useful improvement ir- Drive Mechanisms, for Calculating Machines, of which the following is'e specification.

his invention relates to improvements in rive mechanisms of the nature described in .y application for Potent No. enoery 5., The purpose oi? the invention is to moire the mechanism more cone l tcly automatic in operation whereby the keys ere relieved. of any work oth'crlthen merely serving to release the mechanism While serving their usual function of determining the number of revolutions imported to the drive shaft of the machine.

A it is customary in drive mechanisms for accounting, calculating machines and cash registers wherein the motor may or may not be continuously opereting, to employ e clutch for coupling the motor shaft with the drive shaft of the machine. In the present case, in plaice of the Wclldmown forms of clutches, a. differential gear is utilized to function not only as a clutch but slso as e machine stop, and to determine definitely the number of rotations impert= ed. to the drive shaft of the machine. The ection of the diflercntiel gearing is regulated by lcy-controlled latch mechanism so arranged that While the normally locks the machine proper against operation, the letch may be automatically shifted to release the machine and at the some time stop the idle running part of the differential gearing. When 'the normally idly running port of the difi crentiel gearing is stopped, this part the gcering then serves as on abutment around which the new chine driving part or" the gearing then rev volvcs. At the end of the operation the machine driving port of the after any desired extent of operation while the idle pertof the' geering is again rcleescd.

l' vhlle o primery purpose of the invenmoons easily end le d tor imparting not only the usual single evolution to the drive shaft, but any (lilierent desired number or" contanuously repeated operations oi the drive elicit, the key action is improved and the lime of operation 1s reduced, when more 01 lion the oro ision of inshmitly contro toothed 684,62l, filed position, and restore latch mechanism gearing is stopped L'Wllil MEQMNIKEYM 2'01? fiA'LCULATl'ING MAGHINES.

Serial No. $96,981.

less cxtendcd'multiplying or dividing operations are performed.

The controlling means for the difleren'tiel gearing as herein described and to which this epplicetion for patent is directed, comprises means for simulteheously releasing and stopping opposite parts of the gearing, this stopping and releasing mechanism receiving power'from a driven Worm or other or'threecleol element. In the orrengemcnt shown in the drawing, the worm is keyed to the driven shaft and operates to restore to Hormel position a controller for the differential gesrletch. The controller is in the form of o. key-released member which travels along the Worm upon depression 01": the key until stopped by the depressed key. This member then moves into engagement with the Worm and at the same time the differential gear latch is shifted and the worm is driven, causing the keycontrolled member to return to its normal the diiierentiel gear latch when coming to rest during the last revolution of the Worm.

Of the drawings, Figure 1 is a plan View of the drive mechanism showing the keys and the casing of the machine in section.

Fig. 2 is a. side elevation of the drive inechenism with the casing shown in sec tion.

Figs. 3 and 4 are face views of stop e1emerits carried by the gearing.

Fig. 5 is a dot-ail in side elevation illustinting the appearance when operating after a pressed.

Fig. 6 is a sectional detail of the keyboard taken on the line 6 of Fig. 5.

Fig. 7 is a detail of an arm for shifting the operating cam for the differential gear latch.

Fig. 8 is a detail in sectional elevation of the differential gearing, stop elements cerried thereby, and a worm and cam rotatable with a driven shaft.

ig. 9 is a detail View 9*!) of Fig. 8.

Fig. 10 is a. perspective view oi a stepped plate under the control of the keys and a cooperating serrated key plate partly broken away. 3.

In the drawings, tht: motor shaft, or a shaft geared or bolted to the motor, is indi cated at 1. This is a shortshaft passin through a ball bearing 2 in the side of the key has been detaken on the line of the mechanismshoulder 19 on arm 14 is not uite so rapid because of the employment of a dash pot 48 for controlling its rate of movement.

When the cam 18 is clear of shoulder 19, and the depressed key has moved far enough to cause the shoulder 42, on serrated plate 36 to move out of groove 43, arms 13, 14 and 26 may move downwardly as;a unit under the action of spring '17. The tooth 32 on the member 26 engages the Worm 31 at the point determined by the depressed ke As soon as the stop member 9 is locked y the shoulder 11 on arm 13, the motion of shaft 1 is transmitted through the pinions 4, 5 and 6 to the internal gear 8, thus driving shaft 21 to which the Worm is keyed. The number of rotations given shaft 21 is determined by the number of rotations of Worm 31 required to carry the stepped plate 26 back into engagement with/pin 47 'on the camshifting yoke so that this cam will ,be restored to operative position before. the completion of the last rotation of shaft 21. During the last 180 degrees of movement of shaft 21, the cam 18 restores arms 13, 14 and26 to their upper position. Cam 18 has a surface which is complementary to the surface of stop plate 10 ca. ied by internal gear 8. When the stepped member 26 arrives at about its extreme position under the action of worm 31, the part 41. thereof clears the rear end of the serrated plate 36, permitting this plate to spring back to its normal position and prevent the return of the stepped member 26 until a key is again depressed. I

The serrated plate 36 is not in the form of a key detent in thepresent design of this invention, since this particular design is intended for a class of machines where ex-- trcniely rapid'operation is desirable, and since the main function merely to momentarily act as stops for the differentially movable member 26. l/Vhile this member is being engaged with the Worm, the keys may after a depression, fol.- low the operatofis finger as he relieves the gu'essure on the key. Full stroke devices for the keys, or other customary expedients for preventing undesired manipulation of the keyboard, are dispensed with, and, therefore, two or more keys may be simultaneously de ressed, or a key may be depressed only far enough to disengage the curved surface so of the serrated plate 36 from the part 411 of the step member 26 but not far enough to Withdraw the lug 42 from the groove43 in the member 41. If a plurality the same time, shaft 21 Willbe driven according to the value of the-lowest key. If a key is not depressed far enough to cause the lug 42 to move out of the groove 43 the stepped member 26 may swing-saver as far as the him he a stop 49 being-located adjacent the nine ey for this of i the keys are shown and understood that numerous details of the constructibn shown may be altered or omitted Without departing from the spirit of this invention by the following claims.

I claim: 1

.1. A mechanism of the class described, comprising a driving shaft and a driven operation of the latch 78- but one specific embodiment of to as defined F 3 shaft, differential gearing connecting said {)0 shafts in a manner difie'rential gearing may be idly driven or an element thereof stopped in order to clutch the driven shaft to the driving shaft, means for controlling ing for the purpose of effecting a drive rclation between the two shafts, said means including a normally inoperative element anda manipulative device arranged to re whereby part of the the differential gear 05 lease the said normally inoperative element we and permit it to move into operative position, said normally inoperative element being$5lilferent1ally movable as cnntrolled by sai y' ananipulative device.

2; A mechanism of the class described,

comprisin a driving shaft and a driven shaft, d1flerential gearing connecting said shafts in a ferential gearingmay be idly driven or an manner whereby part of the difelement thereofstopped in order, to clutch the driven shaft to the'drivingshaft, means for controlling the differential gearing for the purpose of effecting a drive relatidn between the .two shafts, said means including a normally I manipulative device arranged to relea'se'the said normally inoperative element and permit it to move into operative position, and driven means for-'rcstoring-said element to its normal position. i

3. A mechanism of the class described, comprising a driving shaft and a driven shaft, difierential gearing connectin said shafts in a manner Wherebypart of t e dif- 1 ferential gearing may element thereof stopped inorder to clutch the driven shaft to the driving shaft, means for controlling the differential gearing for. the pur ose'o effecting a-drive relation between t e two shafts,

inoperative element and a be idly driven. or an said means including 13 a normally inoperative element and a manipi11ative device arranged to release the said normally inoperative eleinent and permit it to move into operative position, driven means for restoring said element to its normal position, and a cam arranged to be 2111- tomatieallyshiftedinto and out of operative relation with said means for controlling the differential gearing.

4. A drive mechanism of the class described, including a drive shaft and a driven'shaft, planetary gearing connecting said shafts, means for controlling said planetary gearin to enact a driving relation between "said s afts for different predetermined amounts, said means comprising depressible keys,- a serrated plate movable member under the action of said keys, a differentially movable member arranged to be released by the motion of said serrated plate, a driven Worm for restoring said different ally movable member, a cam, a latch for the planetarf gearing, said cam being shiftable into an out of engagement with said latch, and

'farrangedto control the shifting of said-cam.

drive mechanism of the class described, including a drive shaft and a driven shaft, planetary gearing connecting said shafts, means for controlling said planetary gearing to ell'ect a driving relation between said shafts for diilerent predetermined amounts, said means comprising depressable keys, a serrated plate movable under the action of said keys, a differentially movable member arranged to be released by the motionl'of said serrated plate, a' driven worm for restoring said dillerentially movable member, a cam rotatable With said Worm, a latch for the planetary gearing, said cam being shiftable into and out of engagement with said latch, and said dilferentially movablemember being arranged to control the I shifting of said cam.

- 6. A' drive mechanism of the class de scribed, including a drive shaft and a drivenshaft planetary gearing connecting said shafts,means forcontrolling said planetary gearing to etl'ect a driving relation between Said Shafts for dillerent predetermined amounts, said means comprising depressant} I said differentially movable member .being keys, a diilerentiallymovable spring operated member arranged to be released and coin trolled in itsmovements by said keys, and

means for positively restoring said diil'erentially movable member.

7. A drive mechanism of the class described, including a drive shaft and a driven shaft, planetary gearing connecting said. shafts, means for controlling said planetary gearing to effect a driving relation between said. shafts for different predetermined amounts, said means comprising depressable keys, a stepped differentially movable niem' her, means for causing said member, to, more into engagement with a depressed key.

means for restoring said differentially movable member after it has engaged a de pressed key, and a latch for the planetary gearing, said difl'erentially movable member being arranged to control the operation of said clutch.

8. A mechanism of the class described,

etary gearing connecting said shafts, means for stopping an element of said planetary gearing whereby it is rendered effective for transmitting motion between said shafts, said means including a manually operable device, and a spring operated dilferentially movable element, a detent for said difierentially movable element, said manually operable device controlling the operation of said detent and the extent of movement of said differentially movable element.

Signed at Chicago this 3rd day of March 1924.

RUDOW nUMMLna 

